chore: removed unused stackTop

[tthuma1]

ScrollTo had an unnecessary variable.

Summary by CodeRabbit

• 优化
  • 改进了滚动同步逻辑，提升了滚动定位的准确性和性能。

[coderabbitai]

Walkthrough

本次变更调整了 useScrollTo.tsx 中计算 item 累积 top 和 bottom 位置的逻辑，移除了 stackTop 变量及其相关更新，改为直接通过前一次循环的 itemBottom 计算当前项的 itemTop，其余循环结构和后续逻辑未变。

Changes

文件/路径	变更摘要
src/hooks/useScrollTo.tsx	移除 stackTop 变量，优化 item 位置计算逻辑

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~6 分钟

Poem

🐇小兔跳跃代码间，
变量消失不见烦，
item 位置巧计算，
循环依旧心不乱。
逻辑清晰如春天，
代码轻盈舞翩跹。

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src/hooks/useScrollTo.tsx

Oops! Something went wrong! :(

ESLint: 8.57.1

Error: Cannot read config file: /.eslintrc.js
Error: Cannot find module '@umijs/fabric/dist/eslint'
Require stack:

• /.eslintrc.js
• /node_modules/.pnpm/@eslint+eslintrc@2.1.4/node_modules/@eslint/eslintrc/dist/eslintrc.cjs
• /node_modules/.pnpm/eslint@8.57.1/node_modules/eslint/lib/cli-engine/cli-engine.js
• /node_modules/.pnpm/eslint@8.57.1/node_modules/eslint/lib/eslint/eslint.js
• /node_modules/.pnpm/eslint@8.57.1/node_modules/eslint/lib/eslint/index.js
• /node_modules/.pnpm/eslint@8.57.1/node_modules/eslint/lib/cli.js
• /node_modules/.pnpm/eslint@8.57.1/node_modules/eslint/bin/eslint.js
  at Module._resolveFilename (node:internal/modules/cjs/loader:1369:15)
  at defaultResolveImpl (node:internal/modules/cjs/loader:1025:19)
  at resolveForCJSWithHooks (node:internal/modules/cjs/loader:1030:22)
  at Module._load (node:internal/modules/cjs/loader:1179:37)
  at TracingChannel.traceSync (node:diagnostics_channel:322:14)
  at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
  at Module.require (node:internal/modules/cjs/loader:1449:12)
  at require (node:internal/modules/helpers:135:16)
  at Object. (/.eslintrc.js:1:14)
  at Module._compile (node:internal/modules/cjs/loader:1692:14)

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 5769845 and d01f874.

📒 Files selected for processing (1)

• src/hooks/useScrollTo.tsx (1 hunks)

🔇 Additional comments (1)

src/hooks/useScrollTo.tsx (1)

79-84: 代码优化很好，逻辑等价且更简洁

移除 stackTop 变量并直接使用上一次迭代的 itemBottom 作为当前的 itemTop 是一个很好的简化。这种改动在数学上是等价的：

• 之前：stackTop 累积高度 → itemTop = stackTop → 更新 stackTop
• 现在：itemTop = itemBottom（来自上一次迭代）

由于 itemBottom 本身就代表累积到当前项的总高度，直接使用它作为下一项的 itemTop 消除了中间变量，使代码更清晰易懂。

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